//! 七层合规验证框架
//! 
//! 基于NAC七层合规验证体系

use serde::{Deserialize, Serialize};
use chrono::{DateTime, Utc};

/// 合规层级
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub enum ComplianceLayer {
    /// 第一层：基础身份验证（KYC/AML）
    IdentityVerification,
    /// 第二层：资产真实性验证
    AssetAuthenticity,
    /// 第三层：法律合规性验证
    LegalCompliance,
    /// 第四层：财务合规性验证
    FinancialCompliance,
    /// 第五层：税务合规性验证
    TaxCompliance,
    /// 第六层：环境社会治理（ESG）合规
    ESGCompliance,
    /// 第七层：持续监控与审计
    ContinuousMonitoring,
}

impl ComplianceLayer {
    /// 获取层级编号
    pub fn level(&self) -> u8 {
        match self {
            Self::IdentityVerification => 1,
            Self::AssetAuthenticity => 2,
            Self::LegalCompliance => 3,
            Self::FinancialCompliance => 4,
            Self::TaxCompliance => 5,
            Self::ESGCompliance => 6,
            Self::ContinuousMonitoring => 7,
        }
    }

    /// 获取层级名称
    pub fn name(&self) -> &'static str {
        match self {
            Self::IdentityVerification => "基础身份验证",
            Self::AssetAuthenticity => "资产真实性验证",
            Self::LegalCompliance => "法律合规性验证",
            Self::FinancialCompliance => "财务合规性验证",
            Self::TaxCompliance => "税务合规性验证",
            Self::ESGCompliance => "ESG合规验证",
            Self::ContinuousMonitoring => "持续监控与审计",
        }
    }

    /// 获取层级描述
    pub fn description(&self) -> &'static str {
        match self {
            Self::IdentityVerification => "验证用户身份、反洗钱（AML）、了解你的客户（KYC）",
            Self::AssetAuthenticity => "验证资产真实性、所有权、估值合理性",
            Self::LegalCompliance => "验证资产合法性、产权清晰、无法律纠纷",
            Self::FinancialCompliance => "验证财务报表、审计报告、资金来源",
            Self::TaxCompliance => "验证税务合规、纳税记录、税务筹划合法性",
            Self::ESGCompliance => "验证环境保护、社会责任、公司治理",
            Self::ContinuousMonitoring => "持续监控资产状态、市场变化、风险预警",
        }
    }

    /// 获取所有层级
    pub fn all() -> Vec<Self> {
        vec![
            Self::IdentityVerification,
            Self::AssetAuthenticity,
            Self::LegalCompliance,
            Self::FinancialCompliance,
            Self::TaxCompliance,
            Self::ESGCompliance,
            Self::ContinuousMonitoring,
        ]
    }
}

/// 合规验证结果
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ComplianceResult {
    /// 合规层级
    pub layer: ComplianceLayer,
    /// 验证状态
    pub status: ComplianceStatus,
    /// 置信度 [0.0, 1.0]
    pub confidence: f64,
    /// 风险等级
    pub risk_level: RiskLevel,
    /// 验证详情
    pub details: String,
    /// 发现的问题
    pub issues: Vec<ComplianceIssue>,
    /// 建议措施
    pub recommendations: Vec<String>,
    /// 验证时间
    pub timestamp: DateTime<Utc>,
}

/// 合规状态
#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
pub enum ComplianceStatus {
    /// 通过
    Passed,
    /// 有条件通过
    ConditionalPass,
    /// 需要人工审核
    ManualReview,
    /// 失败
    Failed,
    /// 待验证
    Pending,
}

/// 风险等级
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Serialize, Deserialize)]
pub enum RiskLevel {
    /// 低风险
    Low,
    /// 中风险
    Medium,
    /// 高风险
    High,
    /// 极高风险
    Critical,
}

/// 合规问题
#[derive(Debug, Clone, Serialize, Deserialize)]
pub struct ComplianceIssue {
    /// 问题代码
    pub code: String,
    /// 问题描述
    pub description: String,
    /// 严重程度
    pub severity: IssueSeverity,
    /// 相关法规
    pub regulations: Vec<String>,
}

/// 问题严重程度
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Serialize, Deserialize)]
pub enum IssueSeverity {
    /// 信息
    Info,
    /// 警告
    Warning,
    /// 错误
    Error,
    /// 严重错误
    Critical,
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_compliance_layer() {
        assert_eq!(ComplianceLayer::IdentityVerification.level(), 1);
        assert_eq!(ComplianceLayer::ContinuousMonitoring.level(), 7);
        assert_eq!(ComplianceLayer::all().len(), 7);
    }

    #[test]
    fn test_risk_level_ordering() {
        assert!(RiskLevel::Low < RiskLevel::Medium);
        assert!(RiskLevel::Medium < RiskLevel::High);
        assert!(RiskLevel::High < RiskLevel::Critical);
    }
}